HP 38C calculator disassembly?
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From: William Sommerwerck on 27 Oct 2009 14:04 Does the calculator have rubber feet on the back? There are often screws under the feet. I had one of the original HP-35s (1972). I'd never heard of RPN, and thought "What's going on here?" After a few minutes using the calculator, I was permanently converted. Why would anyone use algebraic entry?
From: propman on 27 Oct 2009 14:48 Peabody wrote: > Has anyone here ever taken apart one of these calculators? My "6" > key is not registering all the time, and I thought I might be able > to clean out the crud in there and make it work again. But it's not > obvious how one would take one of these apart. I've Googled, but > haven't found anything. If anyone has a relevant link, I would > appreciate it. > > FWIW, I still think these HPs are wonderful. RPN forever! We don't > need no stinkin "=" key. > > don't see anything specific re: 38c at the following site but it might give you an idea on how to proceed: http://www.hpmuseum.org/disasm.htm
From: AZ Nomad on 27 Oct 2009 15:40 On Tue, 27 Oct 2009 11:48:35 -0700, propman <propman(a)nowhere.ca> wrote: >Peabody wrote: >> Has anyone here ever taken apart one of these calculators? My "6" >> key is not registering all the time, and I thought I might be able >> to clean out the crud in there and make it work again. But it's not >> obvious how one would take one of these apart. I've Googled, but >> haven't found anything. If anyone has a relevant link, I would >> appreciate it. >> >> FWIW, I still think these HPs are wonderful. RPN forever! We don't >> need no stinkin "=" key. >> >> >don't see anything specific re: 38c at the following site but it might >give you an idea on how to proceed: >http://www.hpmuseum.org/disasm.htm HP's are not easy to disassemble. Even with well written directions, you're still likely to damage or destroy your calculator. I'd suggest using some contact cleaner to get the crud out. If the membrane switch is worn out then you're only option is to replace the keyboard and replacing the entire calculator with a used one is likely to be cheaper.
From: Charles on 27 Oct 2009 18:51 "William Sommerwerck" <grizzledgeezer(a)comcast.net> wrote in message news:hc7cq2$hvf$1(a)news.eternal-september.org... > Does the calculator have rubber feet on the back? There are often screws > under the feet. > > I had one of the original HP-35s (1972). I'd never heard of RPN, and > thought > "What's going on here?" After a few minutes using the calculator, I was > permanently converted. Why would anyone use algebraic entry? Reverse Polish Notation ... was judged as a racial slur when HP first hit the market ;>) Seriously, I was amazed at how easy it was to learn and how many keystrokes it saved with chain calculations. I am retired and have lost track of RPN .... is it available in modern calculators?
From: William Sommerwerck on 27 Oct 2009 18:58
> I am retired and have lost track of RPN > ... is it available in modern calculators? HP still sells calculators with RPN. These sometimes include algebraic notation to simplify the entry of formulas when programming. It should be noted that almost all "algebraic" calculators are hybrid, mixing RPN with algebraic entry. |